Specifications

Device Driver Entry Points

This chapter describes the standard driver routines and their environment that

the operating system uses as entry points in a device driver program. The

standard entry routines are:

• Alternate start-I/O

• Cancel-I/O

• Cloned UCB

• Controller initialization

• Driver unloading

• FDT

• Interrupt service

• Register-dumping

• Start-I/O

• Timeout handling

• Unit delivery

• Unit initialization

• Unsolicited interrupt service

4–1